Resolution:
No, an adjustable base anchor is not supplied on frames with existing opening anchors.
The anchor design for use in existing masonry walls, is a pierce and dimple in the frame soffit for 3/8"...

Resolution:
A Kerfed Frame is a frame that is formed with an optional integral pocket or recess in the area of the stop to receive gasket, seals or weather stripping.
Kerfed frames are available as an&n...